I agree with solution 1....! Same problem with my sport trac and found the issue in the steering column. A quick way to test it is to adjust the tilt on your steering wheel to a higher setting, if your blinker and lights work it's just a loose wire. Take 5 mins to try this before you spend money on break censors and all the other light, fuse and wiring parts........good luck.
I have fixed this issue on a 2002 and I had the same issue with my 2003 Sport Trac. If you take three or four screws out that holds two plastic pieces from the steering column. Remove the top half and there is a wire connector that holds 8 or nine wires make sure all of them are plugged in tightly. On both my trucks that was the issue and that fixed both of them.
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Yes, it does have a flasher, although it may be a combined unit with the hazard flashers relay. So you hear the clicking of the flasher relay? That seems to indicate the relay is working properly. Have you checked the bulbs and the turn signal fuse? Any turn signal bulbs light up anywhere, front or back?
How about your brake lights, do they work? Your car may have separate, stand alone turn signals in the rear, but many American cars use the same bulb and same filament on the bulb for the brake lights and turn signals. If your merc is like this and the brake lights work, then the bulb must be good. Turn on the hazard flashers and see if all bulbs work and flash at each corner of the car. This would be the same bulb as for the turn signals. If they work, it could be a bad turn signal switch, may even be the flasher relay somehow malfunctioning, and in a few cases, a bad hazard switch can affect the turn signal switch. Check fuses and bulbs first. If you have any type of body control module that controls lights and other accessories, you may have to investigate that. I know I'm not being very helpful, just throwing out a few suggestions. Good luck.
the switch controls both front and rear signal lights.the wires just T off in the harness to go both ways.you don`t say but are the rear bulbs ok.there is 2 filaments in the bulbs one for tail lights and one for signals/brake lights.so the brake lights work if so then the bulbs are good.if not then the bulbs may be the problem.it could also be a wire feed/ground problem that you will have to trace from the sockets back through the system with a test light checking for power and ground.
I'm inclined to believe it is the turn signal switch. When you select left or right, the brake light is removed from that side, and the flasher is connected to the bulb instead, making the brake light on that side flash as the indication that you plan to turn. You have lost everything, but the simple answers check out.
If you have lost signals, brake lights and tail lights, then it is more likely that the ground supplied to the bulbs is not working, since the tail lights share noting in common with the brakes lights and turn signals but ground.
If the tail lights work, the fact that the brake lights and rear turn signals share that switch starts to look meaningful — even more so if the front turn signals also don't work. But the front signals and the rear signals use different circuitry in the switch, so it would be something more mechanical in the switch than electrical in that case.
the brake lights and the rear turn signals should be the same bulb check the bulbs to make sure they are not blown does your third brake light work if all brake light are out and the bulbs are good check the brake light switch on the brake pedal